<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<style>
    .d1{
        margin: 20px 50px 40px 60px;
        width:100px;
        height:50px;
        border:1px solid rgba(255, 0, 0, 0.637)
        } 
</style>
<body>
    <div class="d1" >这个段落没有指定外边距。</div>
</body>
</html>